interwan Packet Transport Alan Hurren

Transcription

1 interwan Packet Transport Alan Hurren

2 Agenda interwan Packet Transport Overview Applications 1

3 ipt - interwan packet transport Ring Protocol Packet Add/Drop/Pass through Efficient Multicast Effective Use of Bandwidth Spatial re-use Ring Protection Fast and reliable layer2 protection Control Access Protocol Ensures fair access to ring BW Class of Service InterWAN Packet Ring 2

4 ipt - interwan packet transport SONET Frame SPE SONET/Optical Connections established between adjacent ipt network elements ipt header Payload ipt header Payload ipt frames mapped into Synchronous Payload Envelope Dual counter rotating packet ring Scalable concatenated payload 3

5 ipt - Ring protocol Tx Ports Rx Ports Egress Frames dropped to appropriate interface. Ingress Frames yield to passthrough frames. Buffered until add opportunity arises. Priority Queuing Priority Queuing Frame header checked for address match. Drop if matched Passthrough if not Copy and drop if multicast bit set Passthrough frames have priority. Buffered for one frame Tx time if collision with Add. Maximum passthrough delay = time to Tx one maximum length add frame at ring rate 4

6 ipt - Multicast Support Frame transmitted onto ring by source node with multicast bit set Multicast packet Frame copied off the ring at each node Frame circulates the ring and removed by the source node More efficient than equivalent point to point scenario which involves packet replication and multiple transmits from source node 5

7 ipt - Spatial Reuse Bandwidth consumed only on traversed segment Destination removal of frames Multiple nodes may transmit concurrently Dynamic, per-packet spatial reuse Statistical Gain for increased BW utilization flow flow STS3c STS3c ipt ring flow 6

8 ipt - Ring Protection Protocol Layer 2 protection No dedicated protection bandwidth Both fibers carry working traffic Fiber Cut Auto-discovery of primary and secondary paths Continuous fault detection Fast detection, protection and restoration 7

9 ipt - Control Access Protocol (CAP) Prevents Starvation during ring Congestion Provides fair/unfair access to shared WAN BW for competing nodes Enabler for over subscribed ring Local Fairness as opposed to Global Fairness Utilized only during periods of congestion 8

10 Agenda interwan Packet Transport Overview Applications 9

11 Differentiated High Speed Data Services to the Enterprises and the ISPs Fiber Access NSP Enterprise SITE C Campus SITE A 10 GE 10/100 BaseT ISP POP 1 1 GE Copper Access CO 1MM Campus Network VPN Internet Access Internet Wholesale POP Interconnect CO (A) 10/100 BaseT Wireless Access SITE B 1MM CO 1MM 100 BaseT CO (B) 1MM Residential + SMB 100 BaseT ISP POP 2 Enterprise 10

12 Carrier Class VPN s Nortel Networks Express 3/12/48 Access rings Nortel Networks OC-48/OC-192/OPTera Backbone rings Nortel Networks Express/ OPTera Access rings interwan interwan interwan Accelar interwan Accelar CO/PoP CO/PoP Accelar End to End 10, 100, & Gigabit Managed VPNs 10/100/1000 Mbps customer access to Carrier s network True VLAN 802.1q service between customer sites Tunable customer access bandwidth from 1M to 1G Scalable to thousands of end users Security/Customer Segregation Multiple Class of Service Offering for voice and video Mechanisms to deliver advanced customer SLA s 11

13 Internet Access Enterprise CLE Router DS1/E1 DS1/E1 DS3/STM1 Today s Transport Network DS3s 4:3:1 DCS 1:0 DCS DS1 DS3 ISP POP Lower cost interface Faster Service turn-up Flexible bandwidth 1M to 1G Enterprise CLE Router 1GE 100Mbps 100Mbps Differentiated Service Dramatic cost reductions interwan Transport Network POP Equipment Cost Reduction Simpler customer adds Scalability: 10 s of thousands of users Saving on POP real-estate 1GE ISP POP 12

14 Affordable High Speed Modem Collector Network CO (A) ipt Ring 1 GE ISP 1 1 GE ISP 2 CO (B) Residential + SMB Network Efficiency + Port Consolidation Services to Multiple ISPs High Speed Connectivity High Availability End to End Network Management 13

15 ipt Values Improve Bandwidth utilization in the network Remove stranded BW (eg. 25 Meg in DS3) Utilitize protection BW in SONET network Spatial Reuse Provide redundant architecture with fast protection switching Dual homed packet rings Provide packet aggregation in the access network Port consolidation at the central office 14